Toxicity of Metals to a Freshwater Ostracod: Stenocypris major

Table 1

Median lethal times (LT₅₀) for S. major exposed to different concentrations for Cu, Cd, Zn, Pb, Ni, Fe, Al, and Mn.

(a)

Measured Cu concentration (μg/L)	LT50 (h)	95% Confidence limits	Measured Cd concentration (μg/L)	LT50 (h)	95% Confidence limits	Measured Zn concentration (μg/L)	LT50 (h)	95% Confidence limits
37.78	76.69	27.15–216.57	49.41	29.89	14.44–61.9	779	260.33	743.38–1562.33
53.18	19.05	9.02–40.26	88.57	16.72	8.53–32.77	1010	100.63	63.30–159.99
126.96	11.86	6.06–23.24	282.91	10.87	5.87–20.12	2456	52.52	32.18–85.71
573.91	7.31	4.30–12.43	508.43	6.29	3.77–10.48	3213	17.59	11.88–26.05
842.65	4.68	2.82–7.77	893.52	3.04	2.12–4.28	4822	13.17	10.31–16.82

(b)

Measured Pb concentration (μg/L)	LT50 (h)	95% Confidence limits	Measured Ni concentration (μg/L)	LT50 (h)	95% Confidence limits	Measured Fe concentration (μg/L)	LT50 (h)	95% Confidence limits
475	110.26	79.32–153.28	19045	105.13	71.40–154.79	548.93	41.36	18.84–90.81
1160	72.39	53.61–97.76	29115	80.76	58.88–110.77	771.18	22.66	11.64–44.10
3410	55.66	42.32–73.21	52045	48.61	32.46–72.78	1084.0	10.13	5.53–18.57
4829	43.55	29.86–63.51	66665	17.59	11.88–26.05	3370.02	6.93	4.02–11.93
8973	9.15	5.90–14.17	90290	13.17	10.31–16.82	5836.64	4.20	2.82–6.25

(c)

Measured Al concentration (μg/L)	LT50 (h)	95% Confidence limits	Measured Mn concentration (μg/L)	LT50 (h)	95% Confidence limits
991	303.15	59.21–1552.17	562.28	155.41	53.84–448.63
4907	103.22	57.48–185.34	861.37	63.31	24.24–165.33
7454	55.66	42.32–73.21	1106.36	33.23	13.65–80.88
10210	43.55	29.86–63.51	3351.91	19.36	9.51–39.41
16348	9.15	5.90–14.17	5519.08	13.08	6.66–25.71